Abstract

Tumor-induced osteomalacia (TIO), a rare paraneoplastic syndrome is seen in association with the overproduction of fibroblast growth factor-23 (FGF-23) by certain mesenchymal tumors in adults. In children, these phosphaturic mesenchymal tumors produce features of rickets similar to TIO. This condition is characterized by elevated blood levels of FGF-23, low phosphate, low or normal active vitamin D, and high alkaline phosphatase. Though the removal of the tumor is curative; in cases where surgical resection is not possible, medical treatment is successful with phosphate and active vitamin D in the improvement of symptoms. The case of a child with features of rickets is presented here to illustrate the importance of identifying this rare condition and instituting appropriate intervention.

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